Adding 'orderBy' causing incorrect query results to be returned.

_From [mr.g.e.a...@gmail.com](https://code.google.com/u/117819506376541286713/) on December 27, 2013 13:49:28_

Steps will reproduce the problem:
1. Run this sample code:

```
var Direction = FOAM({
model_: 'Model',
name: 'Direction',
ids: ['directionID'],
properties: [
{ name: 'directionID', model_: 'IntegerProperty'},
{ name: 'directionCode', model_: 'IntegerProperty'},
{ name: 'directionGroup', model_: 'IntegerProperty'},
]
});

var directions = MDAO.create({model: Direction})
.addIndex(Direction.DIRECTION_CODE)
.addIndex(Direction.DIRECTION_GROUP);

// Initial Data
directions.put(Direction.create({directionID: 1, directionCode: 1, directionGroup: 100}));
directions.put(Direction.create({directionID: 2, directionCode: 1, directionGroup: 100}));
directions.put(Direction.create({directionID: 3, directionCode: -1, directionGroup: 900}));
directions.put(Direction.create({directionID: 4, directionCode: -1, directionGroup: 900}));
directions.put(Direction.create({directionID: 5, directionCode: 2, directionGroup: 500}));

var selection = directions
.where(IN(Direction.DIRECTION_GROUP, [900]))
.where(EQ(Direction.DIRECTION_CODE, -1))
.where(EQ(Direction.DIRECTION_ID, 3));

selection
.select(function(data) { console.log("[plain] ID: " + data.directionID); });

selection
.orderBy(Direction.DIRECTION_GROUP)
.select(function(data) { console.log("[ordered] ID: " + data.directionID); });
```

Expected output:

```
[plain] ID: 3
[ordered] ID: 3
```

Actual output:

```
[plain] ID: 3
[ordered] ID: 3
[ordered] ID: 4
```

Tested on:

```
Google Chrome Version 31.0.1650.63 m
```

_Original issue: http://code.google.com/p/foam-framework/issues/detail?id=139_